Ticket #7293 (closed defect: fixed)

Opened 9 years ago

Last modified 8 years ago

VirtualBox-3.2.x-OSE - guest performance issues with guest kernels >=2.6.32

Reported by: Polynomial-C Owned by:
Component: guest smp Version: VirtualBox 3.2.8
Keywords: Cc:
Guest type: Linux Host type: Linux



I have set up some Gentoo guest systems running on a Gentoo-host machine (kernel- at the time of filing this bug) with eight CPU-cores (2x AMD Opteron 2389, AMD-V is activated). The guests all have four CPUs assigned to them and I don't run more than one of these VMs at the same time.

I observed two problems on the guest machines:

As soon as I am using kernel-2.6.33 or newer in the guest systems they completely freeze after a short period of I/O traffic (like some rsync command or untarring a bigger archive).

When sticking with kernel-2.6.32.x in the guest systems the VM does not freeze but after some bigger compilation sessions (you know, in Gentoo you compile quite a lot ;)) the performance decreases drastically. To give you an example in numbers: Compilation of www-client/seamonkey usually takes about 15 minutes using all four assigned CPU-cores. When this performance decrease occured comilation of the same package takes over two hours still using all four CPUs. htop in the guest shows the CPUs utilized at 100% but htop in the host systems shows that the assigned CPUs only get utilized at roughly 55%-60%.

Please let me know what more information you need. I can attach the kernel .config file from either kernel-2.6.32.x, kernel-2.6.33.x, kernel-2.6.34.x and/or kernel-2.6.35.


VBox.log Download (63.7 KB) - added by Polynomial-C 9 years ago.
I/O freeze with kernel-
VBox.log. Download (63.8 KB) - added by Polynomial-C 9 years ago.
Performance decrease with kernel-
VBox.2.log Download (65.3 KB) - added by Polynomial-C 9 years ago.
Latest freeze with kernel-

Change History

comment:1 Changed 9 years ago by frank

A good start is a VBox.log file of a session when you observed the performance decrease with 2.6.32 and a VBox.log file when you observed a guest freeze after I/O traffic.

comment:2 Changed 9 years ago by Polynomial-C

I have to correct my statement concerning >=kernel-2.6.33 freezes. Not the entire VM is freezing there's just no more I/O happening. For example I can still switch virtual terminals or switch between already opened windows under X but I cannot run anything that needs access to the hard drive.

Changed 9 years ago by Polynomial-C

I/O freeze with kernel-

Changed 9 years ago by Polynomial-C

Performance decrease with kernel-

comment:3 Changed 9 years ago by sandervl73

  • Status changed from new to closed
  • Resolution set to fixed

The performance decrease you've observed is fixed in 3.2.10. You'll have to retry the .33 kernel to see if anything has changed there. Please reopen if that's still a valid problem.

comment:4 Changed 9 years ago by Polynomial-C

  • Status changed from closed to reopened
  • Resolution fixed deleted

Unfortunately the VM still freezes when there's some bigger I/O operations. This is currently with kernel- on both host and guest machines running Gentoo linux.

Changed 9 years ago by Polynomial-C

Latest freeze with kernel-

comment:5 Changed 8 years ago by frank

Still relevant with VBox 4.1.4?

comment:6 Changed 8 years ago by frank

  • Status changed from reopened to closed
  • Resolution set to fixed

No response, closing.

Note: See TracTickets for help on using tickets.
ContactPrivacy policyTerms of Use